15. What does the central limit theorem state about the accuracy of using a sample mean to estima a population mean? a. The accuracy increases as the sample size decreases. (b) The accuracy increases as the sample size increases. c. The accuracy decreases as the sample size increases. d. The accuracy depends on the stability of the sample size. 16. Assume that a marketing research study on frozen pasta results in failing to reject the null hypothesis \\( \\left(\\mathrm{H}_{0}\ ight) \\). What conclusion can be drawn from this? (a.) The sample observations result purely from chance. b. The sample observations are influenced by some non-random cause. c. The study should be replicated as there are abnormalities in the data. d. The alternative hypothesis \\( \\left(\\mathrm{H}_{1}\ ight) \\) should be accepted. 17. A marketing researcher is conducting a study on a new flavor of sports drink. Within supermarkets, 500 customers are randomly selected to taste the product. The customers are asked whether they like or dislike the taste. Regarding statistical inference, what should the researcher do with these data? a. Divide the \"like\" responses by gender to determine whether there is a difference b. Calculate a mean and standard deviation on the results of the question c. Apply confidence interals respondent (d) Apply confidence intervals for proportion